Type-writing machine.



C. F. LUNDEBERG.

TYVPE WRITING MACHINE. APPLICATION FILED AUG. 12. 1910.

1 121,642. V Patented Dec. 22, 1914.

"a citizen of the United States,

' Hartford, in the county of Hartford and "UNTTE CAR Em-Immune, nanrronn, connncricu'r, assienon ro'unnnnwoon TYPE;

' air-mania COMPANY. on NEW vozax, 1v.

arnur orrron.-

315a conronarion or DELAWARE.

TYPE-WRITING MACHINE.

To all whom it may concern: 7 v I Be it known that I, CARL F. LUNDEBERG,

State of Connecticut, have invented certain new and useful Improvements 1n Type- Writing Machines, of which the following is a specification;

Fig. 2

tion.

This invention relates to means for'enabling the. platen to berelea-sed from the control of the usual line-space wheel.

Tn carryingout the invention, the usual line-space wheel is provided with a drum; and an arm within said drum but connected to the platen has a frictional bearing upon the interior periphery of the drum. This bearing is in such a place, and the arm is so pivoted, that an are described by the arm about its pivot would be very nearly parallel with the internal periphery ofthe drum. A spring tends to turn the arm about its pivot, to force it into wedging engagement with said internal periphery of the drum. When attempt is made to rotate the linespace wheel in the same direction as the spring is pressing or to rotate. the platen in the opposite direction), the arm is caused to bind even more firmly against the drum,

so that it becomes impossible to effect relaspace wheel and drum in the opposite direction. Thus any relative movement of the platen and line-space wheel is prevented.

These arms are preferably mounted, upon the same pivot, and are preferably made long enough to extend clear acrossthe drum, so as to exert a suitable wedging action upon the interior of'the drum. Provision is made for forcing the arms to release the drum at will.

ing head and cover plateof the clutchmechanism. Fig. 3 is a sectional view of the platen releasing mechanism i'n'normal posi- Fig. 4 is a rearview of the detent and residing in in use;

In the accompanying drawings, Figure 1 'is a perspective, showing the invention ap plied to an Underwood writing machine. f

is a detail perspective of the releas I Specification of Letters Patent. .Patented Dec. 22,1914. Application filed August 12,1910. seriaiivo'. 576,798;

its releasing lever. Fig. 5 is an end view, the detent and the clutch mechanism,

showing Fig. 6. shows the detent and the clutch members released. Fig. 7 isv a sectional view,- showing the clutch releasing.

mechanism in operative position.

The usual cylindrical platen 1 is mounted rigidly upon an axle 2 journaled in the ends 3 of a platen frame. An annular line-space wheel 4, having a friction drum portion5,

'is mounted loosely upon a disk 6, the latter secured by ahub 6Fto theaxle 2. The disk has an annular flange 7 affording a bearing upon which the wheel and drum may turn.

The edge 6 of the disk fits in a recess in the line-space wheel, to prevent axial displacement of the latter, which is confined between said disk and a cover plate 26. The linespace wheel 4: is operated by a lever 9 hrough a slide 10 and pawl 11, and is engaged by the usual detent. arm 8, which carries a roll 31 to seat inany of the notches in the wheel, the arm 8 being pressed by a spring 32. r

A. pair of clutching arms 12, 12 is pivoted at 13, to the disk or head 6, and extend from side'to side of the drum 5 on opposite sides of the axle 2, and are within the general contour of the flange 7 the latterbeing cut away to give room for the arms to play. I The arms may carry shoes 14 to bear forcibly against thev inner, periphery of the drum to connect the line-space wheel and platen. The arms 12 are so pivoted that their free ends would describe an are nearly coincident with the curvatureof the interior periphery of the drum, against which said arms. (or

the shoes thereon) are pressed by'a spring 15 which forces the arms in opposite directions to bite or grlp the interior periphery of the drum, so that rotation of the linespace wheel and. platen in either direction 1 will cause either one or the other of the arms to bind even-moretightly against the drum. The pivot of each lever, for this purpose, is placed nearly in, a line passing through the axisof the platen and through the central point of contact of the lever (or the shoe thereon) with the inner periphery of the drum 5, as will be understood from Fig. 5, wherein A indicates the line'above the grip between'the arm andwh'eehso that relative rotation of-the line-space wheel and Y mentioned, and B the line passing through V the pivot and contact point of one lever. It

will be understood that one arm12 is pressed by the spring toward the right, andthe d1- rection of itsswing is such that the rotation of, the line-space wheel tov the: right relatively to the platen would tend to turn the arm in the same direction and make it bind more firmly against the drum orwheel- Therefore relative movement of the platen and line-space wheel in this direction: is prevented. The other arm is similarly pressed toward the left, and should the wheel be turned in the same direction, its frictional contact with the. arm would act to tighten platen ln'tlllS direction is also prevented.

'Ihe single bearing surface of the drum 5 serves both to support it revolubly tipon'the flange 7, and also to receivethepressure'of the shoes 14;. l/loreover, owing to the large diameter ofsaid flange 7, the pressure of the shoes u on the'drum, which draws the latteriorcibly against said flange (on the opposite side thereof fromsaid shoes) aids inholding the line space'wh'eel against independent rotation. 'Furthermore" the levers are compactly a'ri'anged'within the flange 7.

The outer ends of the armslz' maybe rounded to form knuckles 25 loosely fitting i .or pivoting in sockets in the shoes, whereby through the head, and by a'hollow boss 23 sliding on the hub 6 of the-disk 6. Said I from the arms 12, whereupon the spring 15 forces the arms apart to forcethe shoes lfl I axle, by. a pair of shoulder screws 2O the latter adjust themselves to the contour of the drum. By pressing inwardly a button, or finger piecelti, which is rigidly connected with a plate 19 by rods '18, the latter passing loosely through the hand wheel 17, said plate is forced against a releasing head 20 Said head 20 carries a pair of cams in the shape of pointed teeth'2l, toengage the outer edges of the respective clutch arms l2and crowd or wedge said arms toward each other, to release the shoes let from forcible contact with the drum, and thereby disconne'ct"the platen from the line-space wheel, (Figs; 6 and 7).

The head 20 is. preferably guided and preventedfrom binding on the jectingifrom the flange 7 and passing loosely arms 12 may be chamfered attheir-outer edges, as at 22, to form bearingsurfaces engaged'bythe beveled ends of the cams 21.

A spring 24: returns the head 20 toiiornial I position, (Fig. 3) withdrawingthe teeth2l a gainst the drum M The aforementioned cover plate 26 may be interposed between the drum 5 g I and the head 20 to protect the clutch mechanism in addition to holding the line-space wheel in place,

, and a platen and I tively thereto, of'a clutch mechanism to con vnect the line space wheel and platen, includ-' ing frictiondogsjin the form of levers'each prosaid smooth pee such plate preferably being secured'to the flange? by the shouldered guides 20*,and having orifices 27 through which the cams 21pass. Y 1 Clhe spring-pressed detent leasing leve'r'28, pivoted -:in,termediate its ends at 29 to the detent arm-8Q The free roiisi may be cast off from the line-space Wheel by La re end of lever 28bears against the druin, 'as-- the lever is swungby itsopposite endlfroin idle position 1g. to active position (Fig. 6), thereby jacking'the detent away from'the line-space wheel. Theend of the 'Haviiig thus described iny invention, *1 claim 1. In a type'writing machine, the combina} g .i tion with a line-space wheel having a drum, and a platen rotatable relatively thereto, of a a friction clutch mechanism to connect the platen and line-space wheel including a pair of wedging arms having a common pivot eccentric to Df he line spj e wheel. to fl'ictlona'uy s s h drum'to lockthe platen and line-space wheel" together, and releasing ,mea contact with the drum.

2. In a typewriting'niachine, the combi-e nation Wlth a lmespace wheel. having a drum, and a platen rotatable relatively thereto, of a clutchmechanis'm to releaa s :to shift said arms out of lever 28 hasa shoe or concavity-30 which fits around the curved surface of the drum;

ably connectthe platenandline-space wheel, including a pair of pivotally" supported wedging arms connected with'the platen and haviii g a common pivot, shoes having bearings uponthe rounded free ends of the arms to enable the shoes to adjust themselves to normally pressed against riphery of the druin at one end and pivoted at the other end, a headslidabl'e along'the platen aXle, beveled teeth projecting from f p andrelease theinfrom the linespace' wheel,, and a finger-piece forslidingsaid head.

the head to eiigagerthe levers 4. In. a typewriting machine, the combifrom the drum to enable I p 7. machine, the combia smooth periphery,

nationwith a line-space wheel, a platen and e its axle, said plate and axle rotatablerela tively to said wheel, the latter having a smooth per phery, of aclutch mechanism to connect the platen and linespace mechanism including pivoted arms, the free ends of g which have frictional wedging engagement with said smooth per phery of the line-space I piece through wheel',a head slidable on the platen axle, teeth projecting from the head and having beveled ends engaging the arms to crowd them toward each other to disconnect the platen and line-space wheel, and a fingerwhich the head is'operated.

5. The combination with a platen and a line-space wheel, of a clutch connection therebetween comprising a drum and a pair of pivoted levers, said levers being mounted to bear at their free ends against the inner periphery of the drum and having a length as great as practicable within the dimensions'of the drum, for effecting an engagement with the drum by a slight movement of said levers, resllient means to press the levers in opposite directions to'connect the line-space wheel to the platen, and means to release said levers.

'6. The combination'with a platen, its axle,

and a line-space Wheel, of a clutch connection therebetween comprising a drum and a pair of pivoted levers, said levers mounted to bear at their free ends against the inner periphery of said drum in normal engagement therewith, the pivot of each lever being so placed that a line from said pivot to the working point of said lever is nearly diametric of the drum, resilient means to press the levers in such opposing directions as to bind the line-space wheel to the platen, I

and means to release said levers; sai releasing means comprising a devicemounted on said axle to slide along the same, and having at one end a finger-piece and at the.

other end beveled members to engage said levers near their free ends.

7 The combination with a platen and a line-space wheel, of connecting means therebetween comprising a drum, a member having an annular flange fitting in'said drum to form a bearing therefor, and a pair of levers pivoted to the flanged member within said flange, the pivot ofreach lever being so said pivot to the placed that a line from working point of said lever is nearly diametric of the drum, said flange cut away to permit the engagement of the levers with the drum, and resilient means to press the levers insuch directions as to bind the drum to said flanged member. 1

8. In a typewriting machine, the combination with a platen, a platen axle, and a line-space wheel, of a pair of dogs for connecting said platen to said line-space wheel, said dogs having a common pivot and extending on opposite sides of the platen axle,

and a bow-spring between said dogs and arranged circunqacent said axle and expand- 9. In atypewriting machine,

nation with a line-space wheelhaving a drum, and a platen j rotatable relatively thereto, of a friction clutch mechanism 1narm is nearly'diametric of the drum,

a nation with a platen and its axle, rotatably mounted on said the combieluding a pair of wedging "arms, each pivoted at one end and extending transversely of the platen axis and at the other end having a shoe pivotally mounted thereon and normally frictionally engaging the inner periphery of the line-space wheel to of each arm being so placed that a line from said pivot to the working point of saig means to shift said shoes out of contact with the drum.

10. In a typewriting machine, the combination with a line-space wheel having a drum, and a platen rotatable relatively thereto, of a disk turning with the platen and having an annular bearing flange thereon having a smooth periphery and a cut away part; the line-space wheel and drum loosely mounted upon the disk and flange so that the latter may turn relatively thereto, the exterior surface of said flange forming a bearing surface for the interior surface of said drum, wedging friction dogs in the formof levers pivoted to the disk and extending thereacross' and projecting through said cut-away part, spring means for pressing the free ends of the levers away from each other into wedging engagement with said interior periphery of the drum to frictionally prevent relative movement between theplaten and the line-space wheel in both" lock the drum and platen together, the pivot directions; the pivot of each lever being so placed that a working point through the axis of the drum, release the levers.

11. The combination with a platen and a line-space wheel, of aclutch mechanism connecting them, comprising a drum and a pair of pivoted levers, said levers at their free ends mounted to bear normally against only the innerperiphery of said drum, the pivot line from said pivot to the of said lever passes nearly and means to of each lever being so placed that a line from said pivot to the working point of said lever is disposed in a direction nearly radial of the drum, to enablea' self-wedging action to occur between the drum andle'ver, resilient means to press the levers in such opposing directions as to prevent relative move ment between the line-space wheel and the platen in both directions, and means to release saidlevers.

12. Ina typewriting machine, the combiof a wheel axle, and a pair of pressure-releasable, pivoted, self-binding members normally clutching together the a wheel and the platen and having their pivots arranged as far as practicable from their working points within the dimensions of the wheel for effecting an engagement between said wheel and said platen by a slight movement of said members,

said members acting connecting and disconnecting mechanism, 1 including a drum 7 frictional surfaces,

'tions. v i 7 13; In a typewriting machine, the combi-.

op positely,

said. wheel andsaid platen in both direcnation with a line-space wheel and a platen rotatable relatively thereto, of intermediate or ring and a pair-of oppositely acting, self-binding levers, said drum and levers havingunyielding opposed resilient .means to force said levers in opposite directions into sursurface, the pivot of each lock said wheel. and platen a ti ve movement face-binding contact with said drum or ring, and means to disengage said drum; said leversso frictional clutching dogs, each pivoted at engaging said one end and at the other end I dog being so placed that the are described ing end of the dog, in moving about its pivot, converges toward the curve of said peripheral surface, iwith the curvature but so nearly coincides of said surface as {to enable'a relative rotation of said Wheel and said platen to cause the dog to bite said sur face and automatically bind itself thereto, to

means to release said dogs. I V p 15. The combination'with a platen, and a [line-space wheel rotatable relativelythereto,

of a connection therebetween comprising a clutch member having a circular peripheral clutching surface, frictional clutching dogs, each engaging said surface at one end and at-the other end hei'ngmounted on a-con'imon pivot-with the other dog, said pivot so placed that the are 1 together; and means to release said dogs.

' described bytheclutching end of each dog,

in moving about its pivot, converges toward thecurve of said peripheral surface, but so nearly coincideslwith the curvature of said surface as to enable arelative rotation of said wheelandsaid platen to cause the dog to bite said surface and automatically bind vitself thereto, to lock said wheel and platen 16. The combination with a platen, and a line-space wheel rotatable relatively there-x to, of a connection therebetween comprising a clutch member having a circular peripheralclutching surface, and a pair of o posed frictional clutching dogs, each pivoted at one end and at the other end 'engagv to prevent relative. movement of by the clutch- I together;

together; and I v 1, ing a circular peripheral clutch ng surface,

and a frict onal and a pair of opposed said platen in one tional clutching .ings'aid surface, the pivot of each dog being so placed that the are described "by the clutching" endof the dog, in moving about its pivot, converges toward the curve-of said peripheral surface, but so nearly coincides with the curvature of said surface as toenable a 'relative'rotation"of saidwheel and said platen to" cause the dog to bite said surface'and automatically bind itself thereto,

to lock said wheel and platen together; and

means torelease said dogs simultaneously;

, 17. The combination with a platen, anda line-space wh'eel rotatable relatively thereto, of a connectiontherebetween comprising a clutch memberhaving a circular peripheral clutching surface, a frictional clutching dog pivoted at one end and at its other end engaging said surface, the pivot of said dog being so placed that the arc described by the clutching end of the dog, in moving about its pivot, converges toward the'curve of said peripheral surface, but so nearly coincides with the curvature of said surface as to enable a relative rotation of said wheel and-said platen in one direction to cause said dog to bite said surface and automatically bind itself theretoyto lock said wheel and said platen together, and self-binding frictional clutching means automatically en gaging said surface during relative rotation of 'said wheel and said platen in the opposite direction, to lock said wheel and platen and'meansto release said dog and said selfebinding means;v I

lSQlhe' conibination avith a platen, and a l iiieespace wheel said Wheel including a clutch member havcIutching dog pivoted at one end and at its otherendengaging said rotatable relatively thereto, of a connection between said platen and surface, the pivot of, said"; dog being so placed that the "arcdescribed bythe clutch- 111g end ofthedog, in moving about its pivot, converges toward the curve-of said peripheral surface but so nearly coincides with the curvature of said surface as to enable a relative rotation of SEIlClWhQQl and,

d rection to cause said i dog to bite said surface and automatically 1 bind itself thereto,

to lock said wheel and platen together; and means tofrelease said dog. I Y

19.; The combination with a platen, and av line-space wheelflrotatable relatively there-v to, of a connection therebet'ween comprising a clutch'member face, the pivot of eachidog'f being soplaced that the arcdescribed by the clutching'end of the dog in moving about its pivot-,pon-

vergesitoward the-curve of said peripheral having a'circular peripheral surface, and a pair of opposed fric-.

dogs, each pivoted atone end and at the, other'end engaging said sur-- surface, but so nearly' coincides with the said vclutching ends into such engagement, curvature of said-surface as to enable a relaand means to release sald dogs.

tive rotation of said Wheel and said platen p I i to cause the'dog to bite said surface and. i CARL LUNDEBERG' automatically bind. itself thereto, to lock Witnesses:

said wheel and platen together; resilient FRANK A. 000K, means interposed between said dogs toforce LYMAND- B UGH QN Copies of this patent may be obtained for five cents each, byaddressing the Commissioner of rateut,

Washington, D. C. Y 

